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Which take-off condition is most likely resulting in the poorest climb performance?
  • A
    5000 ft field elevation, ISA -5°, take-off flaps 10°.
  • B
    sea level field elevation, ISA -20°, take-off flaps 10°.
  • C
    5000 ft field elevation, ISA +20°, take-off flaps 30°.
  • D
    sea level field elevation, ISA +5°, take-off flaps 10°.
The Effect of Air Density
  • Air density affects the mass flow of air into the engine.
  • A decrease in air density reduces Thrust Available.

Therefore, the ability to climb decreases with decreasing air density.
Air density is divided in two components: Temperature and Pressure Altitude.

The Effect of Flaps (or Gear)

Another factor that affects maximum climb performance is the aircraft configuration.
Configuration means whether the flaps (or gear) are extended, or not. If flaps (and gear) are retracted, the aircraft is said to be in the clean configuration.
If flaps (or gear) are extended, parasite Drag will increase deterioration the aircraft climb performance.

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